Eccentric.



A, N. BIRKL'AND.

ECCENTRIC.

APPLlcATloN FILED JAN. l1. |917.

- 1,250,271. Patnd De.18,1917.

INVENTOR ATToH NEV- a suhjeotioftheflingf of. Norwayfresdingiat fao Streeter, i will; the County oi :'StiltSlllclIl. hild- State 0f- NorthfDakota, have invented; cer: tain neuf-and useful"Improvementsfn Ec: olontrcs; of which-the following -fs faigspeoii.- cation.

' 1 .libia-invention, lrelatesfto., an Aeccentric for mowing machinesbnlders: andiheadelS. r and thepilrllyffbject rZ: the.. .invention is to provide an improved means foreimparting a recipi'ocatory motion ,totftlleqpitman ati l Vtached to the cuttingcblads'*whereby the noise and thumping of the other crank wheelsgeneralll-y employed ldeviffzes 'of this character will be obviated. "f

A further object of the invention is to provide an eccentric for driving the pitmanV attached to a cutter bar of a grain cutting machine which `will be steady and noiseless in its operation and constructed so that the pitman and eccentric may be easily detached when the occasion arises.

A further object of this invention is the provision of an eccentric'which consists of comparatively fewV parts and is simple in construction, but durable and well adapted to withstand the rough usage to which devices of this character are ordinarily subjected.

For a full description of the invention and the advantages and merits thereof, reference is to be had to the following description and the accompanying drawings, wherein is illustrated the preferred form of my invention, in which;

Figure 1 is a side elevation.

Fig. 2 is a top edge view- Fig. 3 is a section on the line 3 3 of Fig. 1. p

Referring to the drawing, wherein is Villustrated the preferred form of my invention, and in kwhich like numerals of reference indicate corresponding parts throughout the several views, the extension arm or pusher l'may be attached to a mowing machine, binder, or header in any preferred manner. The eccentric casing comprises two semicircular portions 2 and 3 in which the eccentric is arranged. The portion 2 of the cas- A ing has a tongue 4 which is secured to the end of the bar 1 by the `cleats 5 and 6 which are bolted to the tonguet and the bar 1. The lower half 2 and the upper half 3 of the casing for the eccentric are held in position g EQGENTBIC.

. supplying oil and @Lana appncaeenniedgianuafy11,4917; aseriaiuosinigase., 1 v

cuatev members 8 :and 29 having their-,termie Delsfastened to ftheflower half 2=-:of;,the; cas;-

ing. Tlgie 'proximate-'ends' ofithefarcuate members :are provided `with ears .fiorlugsi 12) through .W'lrichfal fastening bolt11fisfextendi ed for clamping'fthevarcuate: members :8,xand 9-zt0gether thereby retaining .Ithe' upper pore tion :or .cap` 3. off the :asinginfV 'operative' .pio- Sition.,.1;,;.V 'I

; -the 4casingutheI annular j of; asl .provided with two annular. .grooves 312 .for :providing .al iballf rest :for :the ball-'bearings 135.', lThe.. eccentric 14-, =asf1shown .byl "illligf 3 of the drawing, is of the same thickness radial alinement with the ball races 12 and for receiving the ball-bearings 13. An opening in the eccentric 14 yis disposed atene side of the center thereof and receives the "las 11 the width' off? the Acas'iisigf '1t-he pcviriplhery of the eccentric is also provided with grooves for forming ball races l5 inI the purpose of removing the eccentric when Y the occasion arises. A grease cup 17 is mounted upon the casingl for the purpose of A grease to the ball-bearings within the same.

From the foregoing it will be observed that a very simple and durable Veccentric has been provided, the details of which embody` the preferred form. Irdesire it to bel understood however, that slight changes in the minor 'details of construction may bemadc' without departing from thepspirit of the invention or the scope of the claims hereuntov appended.

I claim: Y 1. An eccentric attachment of the character described comprising ashaft, an eccentric mounted upon the shaft andcomprisinga circular disk having an opening at one side of the center thereof, for receiving the said shaft, the latter being keyedv in the said opening to impart a rotary motion to the disk when the shaft is rotated, the periphery of the said disk having annular grooves' laterally 4spaced apart to provide annular ball races, a casing comprising upper and lower sections adapted to lbe assembled to embrace the said eccentric and disposed in'.

spaced relation to the periphery thereof, the

said casing having inner annular ball races alined with the ball races in thesaid disk, a plurality of ball bearings mounted in the ball races and contacting with the disk and the said casing, a clamp band secured to the said. casing and including two co-acting curved portions terminating above the center of the said casing and means for bolting the said portions together.

2. An eccentric attachment of the character described comprising Va shaft and eccentric mounted upon the shaft and comprising a circular disk having an opening at one side of the center thereof, for receiving the said shaft, the latter being keyed in the said opening to impart a rotary motion to the disk when the shaft is rotated, the periphery of the said disk having annular grooves laterally spaced apart to provide annular ball races, a casing comprising upper and lower sections adapted to be assembled to embrace the said eccentric and disposed in spaced relation to the periphery thereof, the said casing having inner annular ball races alined with the ball races in the said disk, a plurality of ball bearings mounted in the ball races and contacting with the disk and the said casing7 a clamp band secured to the said casing and including two co-acting curved portions terminating above the center of the said casing and means for bolting the said portions together, the said portions having their terminals fixed to the lower portions of the casing, ears provided at the opposite ends of the semi-circular portion and a bolt included in the said means and extended through the said ears to draw the said semi-circular portions together for holding the said casing in assembled position.

In testimony whereof I afliX my signature in presence of two witnesses.

ANTON N. BIRKLAND. Witnesses:

A. HEGNEss, ALBERT BIRKLAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1D. C. 

